Bushing well assembly

ABSTRACT

An integrated bushing well assembly for a transformer enclosure having a first conductor portion disposed on a first axis and extending interiorly of the transformer enclosure for connection to the transformer coil, at least two other conductor portions disposed on respective second and third axes and extending exteriorly of the transformer enclosure for connection to respective separable terminators, and an insulating housing for supporting the conductor portions with respect to the enclosure.

United States Patent 1191 Fisher 1451 Sept. 30, 1975 BUSHING WELLASSEMBLY JohnL Fisher, Lexington, Ky.

Inventor:

Assignee:

Filed:

Appl. No.:

Kuhlinan Corporation, Troy, Mich.

Apr. 1, 1974 US. Cl. 174/152 R; 339/126 R; 339/157 R 1m. (:1. H01B17/26; HOlR 21/00 Field of Search 174/11 BH, 18, 19, 74 R, 174/75 R, 751), 142, 152 R, 153 R, 167; 336/107; 339/94 A, 94 R, 126 R,129, 130 R,130 c, 156 R, 157 R, 158, 159 R,160, 161, 162,198 c, 198 E ReferencesCited UNITED STATES PATENTS 8/1918 Berg 339/159 R 9/1964 Goodman...339/198 E X 12/1968 Howe 174/18 X 3,422,392 [/1969 Woods 174/152 R X3,469,223 9/1969 Leonard 174/152 R X FOREIGN PATENTS OR APPLICATIONS985,003 3/1965 United Kingdom 174/18 Primary ExaminerLaramie E. AskinAttorney, Agent, or Firm-Harness, Dickey & Pierce [5 7 ABSTRACT Anintegrated bushing well assembly for a transformer enclosure having afirst conductor portion disposed on a first axis and extendinginteriorly of the transformer enclosure for connection to thetransformer coil, at least two other conductor portions disposed onrespective second and third axes and extending exteriorly of thetransformer enclosure for connection to respective separableterminators, and an insulating housing for supporting the conductorportions with respect to the enclosure.

5 Claims, 7 Drawing Figures 2: nun-.11:

US. Patent Sept. 30,1975 Sheet 1 of 2 3,909,509

US. Patent Sept. 30,1975 Sheet20f2 3,909,509

BUSHING WELL ASSEMBLY BACKGROUND AND SUMMARY OF THE INVENTION Thepresent invention relates to new constructions of bushing wells fortransformer enclosures, and particularly, constructions which providefor feedthrough capability from one separable terminator to a secondseparable terminator. The bushing well constructions of the presentinvention reduce the space requirements for the bushing well and theseparable terminator and reduce cantilever loading of the bushing well.One embodiment of a bushing well of the present invention includes aconductor arrangement having a first conductor portion which is disposedon a first axis and which extends interiorly of the transformerenclosure for connection to the transformer coil, and second and thirdconductor portions which extend exteriorly of the transformer enclosureand which are disposed on respective second and third axes which arenonintersecting with said first axis so that they may be skewed at twoangles with respect to the first conductor portion. The conductorportions are generally surrounded by an insulating housing having threehousing portions which are generally coaxial with respective ones of thethree conductor portions. The housing portion associated with the firstconductor portion extends into the transformer enclosure generally inthe manner of conventional bushing wells while the housing portionsassociated with the second and third conductor portions are exterior ofthe transformer enclosure. A suitable shoulder or the like is providedto seal the opening for the bushing in the housing cooperatively with agasket for that purpose.

A second embodiment of the present invention includes a conductorarrangement having a first conductor portion which is disposed on afirst axis and which extends interiorly of the transformer enclosure forconnection with the transformer coil, and second, third and fourthconductor portions which extend exteriorly of the transformer enclosureand which are disposed on respective axes which intersect at the axis ofthe first conductor portion. The four conductor portions are generallysurrounded by and supported on the enclosure by a housing portion asdescribed above.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a first elevational view ofa first embodiment of a loop-feed bushing well according to the presentinvention;

FIG. 2 is a top elevational view of the loop-feed bushing well of FIG.1;

' FIG. 3 is a second side elevational view of the loop- ;feed bushingwell of FIG. I viewed in the direction of arrows 3-3;

FIG. 4 is a partially cross-sectioned view of the loopfeed bushing wellof FIG. I viewed in the direction of arrows 44;

FIG. 5 is a cross-sectional view of the loop-feed bush- :ing well ofFIG. I viewed in the direction of the arrows '5--5 in FIG. 2, shown incombination with an elbowtype insulated insulated terminator; 3 FIG. 6is a side elevational view of a second embodiment of a loop-feed bushingwell according to this invention; and

FIG. 7 is a top elevational view of the loop-feed bushing well of FIG.6.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIGS. l-S, a firstembodiment of the bushing well 10 according to the present invention isillustrated. The bushing well 10 is mounted in an opening 12 in the wall14 of a transformer enclosure. The bushing well 10 is clamped to thewall 14 by a U-shaped bracket 18 which straddles the bushing well 10.Ordinarily, the transformer enclosure 14 will contain oil so that afluid-type seal between the bushing well 10 and the wall 14 is providedthrough the means of a gasket 16.

The bushing 10 has a conductor 20 with a first portion 22 which extendsinto the transformer enclosure along an axis 23 which is generallyperpendicular to the plane of the wall 14. The first conductor portion22 is provided with a threaded end inside of the enclosure forconnection to a cable which in turn is connected to the transformercoil. The conductor 20 has a second conductor portion 24 which extendsexteriorly of the transformer enclosure and which is generally alignedon an axis 26 which does not intersect the axis 23 of the firstconductor portion 22. It should be noted that the axis 26, as shown inFIGS. 1 and 3, appears to intersect with the axis 23, but in actuality,axis 26 is offset from axis 23 as can be best seen in FIG. 2. In theprojected view of axes 23 and 26 of FIG. 1, the axis 23 is seen to bedisposed at an angle A, preferably 30, with respect to the axis 26. Inthe orthogonal projected view of those axes of FIG. 3, the axis 23 isseen to be at an angle B, preferably l2 /2, with respect to the axis 26.

The conductor 20 has a third conductor portion 28 which is exterior ofthe transformer enclosure and which is disposed on an axis 30 which isnonintersecting with the axis 23. The axis 30 is also disposed at anangle A, preferably 30, with respect to the axis 23 in the projectedview of FIG. 1 and at an angle B, preferably l2 /2, in the orthogonalprojected view of FIG. 3. The axes 26 and 30 are seen to be offset andparallel in the projected view of FIG. 2. A short fourth conductorportion 32 extends perpendicularly of the conductor portion 22 andconnects the conductor portions 24 and 28.

In view of the above description of the conductor portions 22, 24 and28, it will be appreciated that no two of the axes thereof lie in acommon plane, and additionally, by means of the offset ornon-intersecting nature of the second and third axes 26 and 30 relativeto the first axis 23, the second and third axes 26 and 30 are definableby two angular measurements relative to the first axis 23. The aboveconfiguration may be contrasted with a planar Y configuration in whichthe axis of each leg of the Y lies in a common plane and in which eachof the axes may be defined by a single angular measurement.

The loop-feed bushing assembly 10 has a housing 34 of insulatingmaterial which is preferably cast about the conductor 20. The housing 34includes a generally circular first portion 36 which is slightly taperedtoward the threaded end of the conductor portion 22 and is coaxial withthe conductor portion 22, a second generally cylindrical portion 38which is coaxial with respect to the conductor 24, and a third generallycylindrical portion 40 which is coaxial with respect to the thirdconductor portion 28. The second portion 38 and the third portion 40smoothly merge each into the other as seen in the figures. The secondhousing portion 38 and the third housing portion 40 provide an annularshoulder 42 which is perpendicular to the axis 23 and which sealinglyabuts the gasket 16.

As can be best seen in FIG. 5, the housing portion 38 has aninwardly-tapering coaxial bore 44 which terminates at a coaxialcylindrical projection 46. The conductor portion 24 has a threaded endwhich projects from the cylindrical projection 46 to permit itsconnection to an insulated separable connector insert to be described.The housing portion 40 has an inwardly tapering coaxial bore 48 whichterminates at a coaxial cylindrical projection 50. The conductor portion28 has a threaded end which projects from the cylindrical projection 50to permit its connection to an insulated separable connector insert aswill also be described.

The exterior of the housing 34 is preferably coated with an electricalcoating so as to carry the ground potential at the wall 14 to theseparable terminators.

With particular reference now to FIG. 5, the manner of connecting aninsulated separable connector insert 52 to the exterior conductorportions 24, 28 is shown. The separable connector insert 52 has acentral conductor with a threaded bore located in a coaxially extendedcylindrical portion 56 which threads onto the threaded end of theconductor portion 24. The separable connector insert 52 has a resilientannular collar 58 which sealingly grips the external cylindrical surfaceof the housing portion 38. Insulated separable connector inserts, asshown at 52, are known in the art, and therefore, a detailed descriptionthereof will not be provided. A separable elbow-type terminator 60 issecured to the separable connector insert 52 and provides an electricalconnection therewith. Elbow-type terminators, as shown at 60, are alsoknown in the art, and therefore, a detailed description thereof will notbe provided.

In FIGS. 6 and 7 yet another embodiment of a bushing well assembly 70according to the present invention is illustrated. The bushing well 70of FIGS. 6 and 7 has three external taps to provide an accessoryconnection as well as a feedthrough connection. The bushing well 70 hasa shoulder which is in sealed engagement with the wall 14 of atransformer enclosure through the means of the resilient gasket 16. Thebushing well 70 has .a conductor assembly 72 including a first conductorportion 74 which extends into the transformer enclosure. The firstconductor portion 74 is located on an axis 76 which extendsperpendicularly with respect to the wall 14. The conductor assembly 72further includes a second conductor portion 78 located on an axis 80, athird conductor portion 82 located on an axis 84, and a fourth conductorportion 86 located on an axis 88. Each of the conductor portions 78, 82and 86 has threaded ends and extends exteriorly of the transformerenclosure for connection to separable terminators as described above.Each of the axes 80, 84 and 88 intersects with the axis 76 and isequidistantly disposed relative to each other, i.e., each being disposedat an angle of 120 relative to each other. Additionally, the Y tion 96which is coaxial with the conductor portion 78, and a fourth generallycylindrical portion 98 which is coaxial with the conductor portion 86.Each of the housing portions 94, 96 and 98 has an inwardly taper-.

terminator assembly so that these bushing wells may be used withexisting transformer enclosures which may have limited space for suchassemblies. Furthermore, it will be appreciated that the bushing wellconstructions of the present invention advantageously minimize thecantilever stresses on the bushing well.

It is to be understood that the foregoing description is that ofpreferred embodiments of the invention. Various changes andmodifications may be made without departing from the spirit and scope ofthe invention as defined by the appended claims.

What is claimed is:

1. For a transformer having an enclosure, a bushing well comprising a.conductor means having 1. a first conductor disposed on a first axis forconnection to said transformer,

2. a second conductor disposed on a second axis for connection to afirst terminator means and extending outwardly of said enclosure,

3. a third conductor disposed on a third axis for connection to a secondterminator means and BX- tending outwardly of said enclosure,

4. a fourth conductor attached to said first conductor and beingdisposed between and connected to said second and third conductors,

5. said three axes being disposed so that they are non-intersecting andso that no plane may be defined which contains any two of said axes,

6. at least one of said second and third axes being inclined at twoangles with respect to said first axiswith each of said two angles beingdefined in respective orthogonal projections, and

b. insulating means connected to said first, second,

third and fourth conductors for supporting said conductor means relativeto said enclosure and for insulating said conductor means therefrom.

2. A bushing well according to claim 1 wherein said insulating means hasfirst, second and third insulating means portions with each of saidportions surrounding a respective one of said first, second and thirdconductors.

3. A bushing well according to claim 2 wherein said insulating means hasshoulder means for cooperation with said enclosure for providing a fluidseal with said enclosure.

4. A bushing well according to claim 1 wherein said insulating means hasa first portion surrounding said first conductor and second and thirdportions surrounding said second and third conductors with said secondand third portions joining said first portion so as to define a shoulderfor cooperation with said enclosure to provide a fluid seal with saidenclosure.

5. A bushing well according to claim 1 wherein both gles being definedin respective orthogonal projections.

1. For a transformer having an enclosure, a bushing well comprising a.conductor means having
 1. a first conductor disposed on a first axis forconnection to said transformer,
 2. a second conductor disposed on asecond axis for connection to a first terminator means and extendingoutwardly of said enclosure,
 3. a third conductor disposed on a thirdaxis for connection to a second terminator means and extending outwardlyof said enclosure,
 4. a fourth conductor attached to said firstconductor and being disposed between and connected to said second andthird conductors,
 5. said three axes being disposed so that they arenonintersecting and so that no plane may be defined which contains anytwo of said axes,
 6. at least one of said second and third axes beinginclined at two angles with respect to said first axis with each of saidtwo angles being defined in respective orthogonal projections, and b.insulating means connected to said first, second, third and fourthconductors for supporting said conductor means relative to saidenclosure and for insulating said conductor means therefrom.
 2. a secondconductor disposed on a second axis for connection to a first terminatormeans and extending outwardly of said enclosure,
 2. A bushing wellaccording to claim 1 wherein said insulating means has first, second andthird insulating means portions with each of said portions surrounding arespective one of said first, second and third conductors.
 3. A bushingwell according to claim 2 wherein said insulating means has shouldermeans for cooperation with said enclosure for providing a fluid sealwith said enclosure.
 3. a third conductor disposed on a third axis forconnection to a second terminator means and extending outwardly of saidenclosure,
 4. a fourth conductor attached to said first conductor andbeing disposed between and connected to said second and thirdconductors,
 4. A bushing well according to claim 1 wherein saidinsulating means has a first portion surrounding said first conductorand second and third portions surrounding said second and thirdconductors with said second and third portions joining said firstportion so as to define a shoulder for cooperation with said enclosureto provide a fluid seal with said enclosure.
 5. A bushing well accordingto claim 1 wherein both of said second and third axes are inclined attwo angles with respect to said first axis with each of said two anglesbeing defined in respective orthogonal projections.
 5. said three axesbeing disposed so that they are non-intersecting and so that no planemay be defined which contains any two of said axes,
 6. at least one ofsaid second and third axes being inclined at two angles with respect tosaid first axis with each of said two angles being defined in respectiveorthogonal projections, and b. insulating means connected to said first,second, third and fourth conductors for supporting said conductor meansrelative to said enclosure and for insulating said conductor meanstherefrom.